EP1695552A2 - Chiffrement de session composite d'un contenu video a la demande - Google Patents

Chiffrement de session composite d'un contenu video a la demande

Info

Publication number
EP1695552A2
EP1695552A2 EP04795278A EP04795278A EP1695552A2 EP 1695552 A2 EP1695552 A2 EP 1695552A2 EP 04795278 A EP04795278 A EP 04795278A EP 04795278 A EP04795278 A EP 04795278A EP 1695552 A2 EP1695552 A2 EP 1695552A2
Authority
EP
European Patent Office
Prior art keywords
portions
encryption
content
vod
decryption
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04795278A
Other languages
German (de)
English (en)
Other versions
EP1695552A4 (fr
EP1695552B1 (fr
Inventor
Leo M. Pedlow Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Electronics Inc
Original Assignee
Sony Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Electronics Inc filed Critical Sony Electronics Inc
Publication of EP1695552A2 publication Critical patent/EP1695552A2/fr
Publication of EP1695552A4 publication Critical patent/EP1695552A4/fr
Application granted granted Critical
Publication of EP1695552B1 publication Critical patent/EP1695552B1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H04N21/23473—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by pre-encrypting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23895—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
    • H04N21/23897—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption by partially encrypting, e.g. encrypting only the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests

Definitions

  • the systems by design, employ proprietary technology and interfaces precluding the introduction of non-incumbent equipment into the network.
  • An MSO once choosing one of these suppliers during conversion from an analog cable system to a digital cable system, faces a virtual monopoly when seeking suppliers for additional equipment as their subscriber base or service offering grows.
  • the only exit from this situation was to forfeit the considerable capital investment already made with the incumbent provider, due to the intentional incompatibility of equipment between the incumbent and other sources.
  • One primary barrier to interoperability is in the area of conditional access systems, the heart of addressable subscriber management and revenue collection resources in a modern digital cable network.
  • the PassageTM technologies were developed to allow the independent coexistence of two or more conditional access systems on a single, common plant.
  • a secondary PID (or shadow PID) is also assigned to the program content. Selected portions of the content are encrypted under two (or more) encryption systems and the encrypted content transmitted using both the primary and secondary PIDs (one PID or set of PIDs for each encryption system).
  • the so-called legacy STBs operate in a normal manner decrypting encrypted packets arriving under the primary PID
  • the newer (non-legacy) STBs operate by associating both the primary and secondary PIDs with a single program. Packets with a primary PID are decoded normally and packets with a secondary PID are first decrypted then decoded. The packets associated with both PIDs are then assembled together to make up a single program stream. The PID values associated with the packets are generally remapped to a
  • FIGURE 1 is a block diagram of a clear video NOD system.
  • FIGURE 2 is a block diagram of a composite session based encrypted VOD architecture consistent with certain embodiments of the present invention.
  • FIGURE 3 is a flow chart depicting operation of - -composite session based encrypted VOD embodiment consistent with certain embodiments of the present invention.
  • RAM Random Access Memory
  • RAID Redundant Array of Independent Disks
  • Critical Packet A packet or group of packets that, when encrypted, renders a portion of a video image difficult or impossible to view if not properly decrypted, or which renders a portion of audio difficult or impossible to hear if not properly decrypted.
  • critical should not be interpreted as an absolute term, in that it may be possible to hack an elementary stream to overcome encryption of a "critical packet", but when subjected to normal decoding, the inability to fully or properly decode such a "critical packet” would inhibit normal viewing or listening of the program content.
  • Selective Encryption or Partial Encryption
  • Trick mode an operational mode of playback of digital content to simulate fast forward, rewind, pause, suspend (stop), slow motion, etc. operations as in a video tape system.
  • the terms “a” or “an”, as used herein, are defined as one, or more than one.
  • the term “plurality”, as used herein, is defined as two or more than two.
  • the term “another”, as used herein, is defined as at least a second or more.
  • the terms “including” and/or “having”, as used herein, are defined as comprising (i.e., open language).
  • the term “coupled”, as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically.
  • program is defined as a sequence of instructions designed for execution on a computer system.
  • a "program”, or “computer program”, may include a subroutine, a function, a procedure, an object: method, an object implementation, in an executable application, an applet, a servlet, a source code, an object code, a shared library / dynamic load library and/or other sequence of instructions designed for execution on a computer system.
  • the terms “scramble” and “encrypt” and variations thereof may be used synonymously herein.
  • the term “television program” and similar terms can be interpreted in the normal conversational sense, as well as a meaning wherein the term means any segment of A/N content that can be displayed on a television set or similar monitor device.
  • VOD Video
  • STB television Set-Top Box
  • CA Conditional Access
  • VOD ARCHITECTURES The decision on a particular VOD architecture is the result, of the interaction, between a complex set of both independent and dependent variables, providing a solution to an equation of state. Some of the variables are fixed directly as a result of choices by the MSO. Others are constrained by factors such as the existing incumbent system, location, size, available capital and return on investment requirements.
  • a generalized VOD system 10 contains some or all of the following elements / resources: Content Aggregation and Asset management 14, Content distribution (SAN) 18, Video server module(s) 22, Session Management 26, Transaction management 30, Billing system 34, EPG server or VOD catalog server 38, Transport router/switch fabric (routing matrix) 42, Stream encryption device(s) (not shown in this Figure), and QAM modulators/upconverters and other edge resources 46.
  • This VOD system 10 provides programming to the, subscriber terminals such as 50 for ultimate viewing and listening on a TV set or other monitor device 54. In operation, content is received from Various sources including, but not limited to, satellite broadcasts received via one or more satellite dishes 58.
  • Content is aggregated at 14 and cataloged at EPG server or VOD catalog server 38. Content is then distributed at 18 to one or more video servers 22.
  • a subscriber orders a VOD selection, a message is sent from the subscriber terminal (e.g., STB) 50 to the session manager 26.
  • the session manager 26 notifies the transaction manager 30 to assure that the billing system 34 is properly brought into play.
  • the session manager 26 selects a VOD server from a cluster of VOD servers having the requested content on it and having a signal path . that reaches the node serving the subscriber.
  • the session manager also enables the routing matrix 42 to properly route the selected video content through the correct edge resources 46 for delivery to the subscriber terminal 50. '
  • NOD PROGRAM SPECIFIC INFORMATION A function of the VOD video server(s) 22, in addition to origination of session A/V content, is the creation of the associated, session specific PSI. (program specific' information). This information is a departure from the broadcast model in that the PSI. is , extremely dynamic. The content of the PAT and subordinate PMTs change whenever a new session is started or ended. In the broadcast world, the PSI changes very seldo because the PSI tables reflect only the structure of the transport multiplex, not the actual A/V content carried within.
  • the NOD video server 22 or associated headend hardware or software dynamically assigns a new session to an existing, available "slot" in an outgoing transport multiplexed stream.
  • the slot is denoted by the MPEG program number and in many cases, the combination of which transport stream (TSID) and program number determine at the service level a unique session and the routing that occurs as a result.
  • Edge resources 46 generally are not configured dynamically. The routing of content appearing on a particular input port to a specific QAM carrier at the output is determined through a preconf ⁇ gured, static assignment of TSID/input port and program number mapping to specific QAM resources in the device. This same mapping information is also loaded in the NOD system so that once a session is requested by and authorized for a specific subscriber terminal 50, a solution to a routing matrix 42 can be determined to find the appropriate NOD server 22 and QAM transport 46 serving the requestor.
  • This solution also considers dynamic issues such as which servers 22 the requested asset is loaded upon, and server loading/available slots in addition to the simpler, static solution to finding the first possible path to the requesting subscriber terminal 50.
  • elements of the same information are also communicated to the session client at subscriber terminal 50 at the subscriber's premises so that the requested stream can be properly received and presented to the subscriber.
  • NOD Clear NOD distribution system
  • FIGURE 1 Perhaps the simplest NOD implementation is a clear NOD distribution system, i.e. one that contains no encryption as depicted in FIGURE 1. While not providing any safekeeping of what might be considered the entertainment medium's most valuable properties, namely current feature films, etc., clear NOD avoids many of the issues that the incumbent cable system providers to date have not adequately addressed and that introduction of a second, alternative CA system complicates even further still.
  • Various arrangements for providing selective or full encryption in a VOD environment are discussed below. Throughout this discussion, it is instructive to carry an example VOD movie through the various embodiments to illustrate the relative storage efficiencies obtained with the various systems disclosed.
  • VOD movie which will be used throughout this document has the following attributes: Compressed video data rate: 3Mbit/S Movie length: 120 minutes (2 Hrs) I-frame overhead: 17% - Total storage used for the video portion of a single, clear (unencrypted) copy of a film: 3.6l8GBytes.
  • the encryption device 22 is modified to add an encryption device in series with the transport stream between the video server 22 and the QAM modulator of 46. .
  • the encryption device may be integrated with the QAM modulator 46 and/or other components.
  • the commercially available Scientific-Atlanta MQAM and Harmonic NSG products are commercial examples of such devices.
  • the outgoing transport stream, containing multiple, independent VOD sessions and serving multiple subscribers, is encrypted at the point of distribution to the plant and in turn to the subscribers.
  • the control of the encryption and entitlements is based upon interaction between the session manager 26, which controls the session, video server 22 and the conditional access system through defined interfaces.
  • Many session based VOD architectures share the following common drawbacks: • Coordination and/or distribution of entitlements and .
  • the encryption device(s) downstream of the video server will append CA information specific to each session processed at the time/point of encryption.
  • the VOD session manager 26 manages which streams are processed by which CA method and in some cases, manages dynamically routing the streams to/through the encryption devices appropriate for a particular session.
  • CA method a method for processing data
  • CA method a method for processing data
  • dynamically routing the streams to/through the encryption devices appropriate for a particular session.
  • the composite session based encryption approach is a type of session-based approach that allows multiple conditional access systems to operate in a single VOD system.
  • the appropriately encrypted stream is provided to a subscriber by routing the outgoing stream from the VOD server 22 to the subscriber terminal 50 on a transport stream and resultant RF carrier, carrying multiple conditional access formats and multiple sessions in a single heterogeneously encrypted multiplex.
  • a single transport may contain any combination of two or more CA formats operating independently on a program basis representing individual subscriber sessions.
  • the content is processed by the VOD server 22 through internal software, or by an external device such as selective encryption processor 104.
  • This process identifies and segregates "critical" packets (see definition above) using any suitable selective encryption selection process. That is, it identifies packets that are to be encrypted later.
  • the "critical" packets are segregated by associating them with one or more new, previously unused PIDs.
  • the composite stream made up of the original bulk, "non-critical" content and segregated "critical” content can be either stored as a single asset (e.g., a single file) on the VOD server 22 or the content may be stored in two separate files (“critical” and "non-critical”) with each transmitted separately.
  • new PIDs could be assigned to each of the "critical” and “non-critical” content.
  • the content can be stored unencrypted (in the clear). If one refers to the example movie scenario described above, the same movie using 3.618GB of storage in the clear VOD state would require 3.6 ⁇ 8GBytes to store using composite session based encryption supporting two (or more) different CA systems.
  • the session manager 26 provisions either the legacy CA system 108 or the alternate CA system 112 (depending upon whether the subscriber terminal 50 is capable of legacy or alternate decryption).
  • the legacy CA system 108 provisions the legacy encryption device(s) to carry out the encryption process.
  • the legacy encryption device 116 is configured to encrypt packets identified by the new PIDs associated with "critical" content and the. content is routed from VOD server 22 by routing matrix 120 the legacy encryption device 116.
  • the "non-critical" content bypasses the legacy encryption device altogether and is routed by routing matrix 120 directly to routing matrix 124 by path 134.
  • the selectively encrypted content along with the non- "critical" content received via route 134 is routed by routing matrix 124 through add/drop re-multiplexer 128, alternate encryption device 132 and edge resources 46 to the subscriber terminal 50.
  • the alternate encryption device 132 simply passes the content without acting on it since the alternate encryption device 132 has not- been configured to carry out encryption of the content passing therethrough.
  • the add/drop re-multiplexer 128 reconstitutes the content from legacy encryption device 116 and from path 134 into a single stream by interleaving the incoming packets ("critical" and "non-critical") into a single correctly ordered stream.
  • Add drop re-multiplexer serves to re-clock the stream by inserting new timing information and may also remap the PIDs if required (and may also modify the PSI information if necessary) to assure that the stream is a proper MPEG transport stream that carries a unique set of PIDs appropriate to the destination subscriber terminal for the current session.
  • the PIDs may be remapped for storage on the VOD server, but this remapping only segregates the "critical" and "non-critical" content. Prior to transmission to the subscriber, the PIDs can be remapped to assure that each instance of the content playback associated with each VOD session carries a unique set of PIDs that are used by the individual subscriber terminal associated with the particular VOD session. Thus, the same content may be sent to many subscribers using different sets of PIDs in order to distinguish the different sessions.
  • the legacy encryption device 116 is lightly loaded since it may only have to process roughly 2-10% of the content ultimately destined to the subscriber terminal 50.
  • the headend and network can utilize fewer legacy encryption devices 116 resulting in reduced capital expenditures and reduced hardware requirements.
  • the session manager 26 provisions the alternate CA system 112 to carry out the encryption processing of the stream.
  • Alternate CA system 112 thus provisions the alternate encryption device to encrypt packets bearing the PIDs of the "critical" packets.
  • the "critical" packets as well as the "non- critical" packets are routed through routing matrix 120 along path 134 to routing matrix 124 to add/drop re-multiplexer 128 to the alternate encryption device 132.
  • the retimed stream from the add/drop re-multiplexer 128 is then selectively encrypted (or fully encrypted) at the alternate encryption device 132 before being routed via edge resources 46 to the subscriber terminal 50.
  • edge resources 46 is shown to incorporate QAM and RF functions. However, in many configurations, the edge resources may also incorporate any or all of the alternate encryption device 132, the add/drop re-multiplexer 128 and possibly even the routing matrix 124.
  • a Video On Demand (VOD) server arrangement has a device for receiving content from a selective encryption processor that processes content to be delivered in a VOD method by selecting first portions of the content for encryption under a selective encryption system and selecting second portions of the content to remain unencrypted.
  • VOD Video On Demand
  • At least one computer readable storage device is incorporated and a processor that: stores the first and second portions in the at least one computer readable storage device; receives a request for delivery of the content, the request being from a terminal having decryption capabilities associated with either a first decryption method or a second decryption method; and determines if the request is from a terminal having decryption capabilities associated with a first decryption method or a second decryption method. If the request is from a terminal having decryption capabilities associated with the first decryption method, then a routing arrangement routes the first portions to a first encryption device and routes the second portions around the first encryption device.
  • a first encryption device encrypts the first portions using a first encryption process to produce encrypted first portions; and the stream of selectively encrypted content is assembled from the encrypted first portions and the second portions.
  • the request is from a terminal having decryption capabilities associated with the second decryption method: the stream of content is assembled from the first portion and the second portion; the routing mechanism routes the stream to a second encryption device; and a second encryption device encrypts the first portion using a second encryption process to produce a selectively encrypted stream.
  • the process 200 depicted in FIGURE 3 can be utilized starting at 204.
  • the content is stored on the VOD server 22 with "critical" packets identified, e.g., using a new PID.
  • a request is received for content from a subscriber terminal 50 at 212
  • a determination is made as to the decryption capability of the subscriber terminal 50 (e.g., STB) at 216. If the subscriber terminal is enabled for a first encryption system (e.g., a legacy encryption - system) at 216, control passes to 222 where "critical" packets are routed to a CAl enabled encryption device (116) for encryption of the selected packets.
  • “Non-critical" packets are routed around the CAl enabled encryption device 116 at 226.
  • the stream is reconstituted and retimed by appropriately interleaving and retiming the encrypted "critical" packets with the "non-critical" packets.
  • the reconstituted selectively encrypted content is then routed to the subscriber terminal 50 at 236 and the process returns at 240.
  • control passes to 244 where both the "critical" and the "non-critical" packets are routed around the CAl encryption device.
  • the packets are retimed and interleaved to reconstitute the stream at 248.
  • the reconstituted stream is then passed through the CA2 encryption device at 252 for selective encryption of the
  • a VOD method involves processing content by selecting first portions of the content for encryption under a selective encryption system and selecting second portions of the content to remain unencrypted. The first portions and the second portions are stored. Upon receipt of a request for delivery of the content, the process involves determining if the request is from a terminal having decryption capabilities associated with a first decryption method or. a second decryption method.
  • the process involves routing the first portions to a first encryption device; routing the second portions around the first encryption device; encrypting the first portions using a first encryption process at the first encryption device to produce encrypted first portions; and assembling a stream of selectively encrypted content from the encrypted first portions and the second portions.
  • the process involves assembling a stream of content from the first portion and the second portion; routing the stream to a second encryption device; and encrypting the first portions using a second encryption process at the second encryption device to produce a selectively encrypted stream.
  • the storage requirement and complexity of the session playback are reduced since the routing decisions around the legacy encryption device(s) can optionally be eliminated.
  • This arrangement also eliminates the need for the add drop multiplexer and the remapping of PIDs to reconstitute a full transport stream.
  • the negative aspect of this version of the topology is additional legacy encryption equipment since the full transport multiplex for each legacy session is passed through the legacy encryption device.
  • many more (perhaps ten to fifty times more) legacy encryption devices are used to provide the same level of service than the system ; described above.
  • the advantage offered is the savings in hardware and capital equipment required to add a conditional access system to an existing VOD system, which presently has no multiple encryption capability, as is the case at present in most U.S. cable systems. Additionally, it does not create a capital cost penalty to introduce two concurrent yet independent CA systems to a VOD system since some 70% of the systems currently deployed have QAM edge devices containing latent capability to perform CA encryption (such devices are commercially available from Harmonic NSG).
  • a new session is initiated in which the VOD session manager determines which conditional access format is compatible with the requesting subscriber terminal equipment (e.g., set top box) based upon information received directly from the subscriber equipment or from another resource such as the billing system 34.
  • the VOD session manager 26 determines the path to the appropriate encryption resource(s) having access to an RF node serving the subscriber's service area. The process that follows then depends upon what type of encryption equipment is employed to provide the VOD content to the subscriber. If the session is destined for a legacy encryption enabled subscriber terminal, the session manager initiates encryption of the session via the legacy CA system 108, which in turn provisions the legacy encryption device 116. The legacy CA system is commanded only to process packets bearing the PIDs representing "critical" content to be encrypted. The remaining content (the bulk of the content) is identified by a different PID and is left unencrypted, and in fact bypasses the legacy encryption device 116.
  • the edge devices which may contain add/drop multiplex, second CA encryption and QAM modulator elements, is configured by the session manager 26 to remap the segregated "critical" content and "non-critical" data back to a single, common PID. If the "critical" content is stored in a separate file on the VOD server 22, then the two files representing the entire content is streamed. In this case, routing matrix 120 is also tasked to send the "non-critical" content around the legacy encryption device via path 134, thus freeing bandwidth from the encrypter so that roughly a 10 to 50 fold improvement in session capacity can be realized on a single encryption device. The bypass stream is recovered as part of the functions of routing matrix 124.
  • the "non-critical" and encrypted “critical” content streams are still recombined into a single stream at the add/drop re-multiplexer 128, which may be incorporated into the edge device.
  • the session manager 26 initiates the encryption of the session via the alternative conditional access system 112, which in turn provisions the alternate CA encryption device 132.
  • the alternative CA system is commanded to process all the PIDs on the original transport PID, which initially carries only the "non-critical" content.
  • the session manager 26 configures the routing matrix 120 and 124 to send the content along path 134 to bypass the legacy encryption device, which has no function in delivery of content to a non-legacy encryption enabled subscriber terminal.
  • the add/drop re-multiplexer 128, the second CA encrypter 132 and the QAM modulator and RF elements 46 are configured by the session manager 26 to re-map the segregated "critical" data and the "non-critical" data back to a single, common PID which is then subsequently encrypted as described above at alternate encryption device 132. If the "critical" content is stored in a separate file on the VOD server 22, then the two files representing the entire content selection is streamed to the subscriber terminal. In this case, the "non-critical" and “critical” content streams are still recombined into a single stream (e.g., at add/drop re-multiplexer or other location in the edge devices) prior to alternative encryption.
  • the "critical" and “non-critical” content can be stored as a single file at VOD server 22.
  • the full content (“critical” and “non-critical”) is routed through either the legacy encryption device 116 or the alternate encryption device 132.
  • the content from the single file can be routed based upon PID by routing matrix 120 either to legacy encryption device 116 or routing matrix 124, essentially splitting the single file for selective encryption before reconstitution of the stream.
  • blocks 208 and 212 of process 200 are modified to reflect that the content is stored in a single file and that the file is split into "critical" and "non-critical" content upon receipt of a request for the content.
  • a Video On Demand (VOD) method involves receiving a request for delivery of content; retrieving the content from a storage medium; processing the retrieved content by selecting first portions of the content for encryption under a selective encryption system and selecting second portions of the content to remain unencrypted; and determining if the request is from a terminal having decryption capabilities associated with a first decryption method or a second decryption method.
  • VOD Video On Demand
  • the process involves routing the first portions to a first encryption device; routing the second portions around the first encryption device; encrypting the first portions using a first encryption process at the first encryption device to produce encrypted first portions; and assembling a stream of selectively encrypted content from the encrypted first portions and the second portions.
  • the embodiment involves assembling a stream, of content from the first portion and the second portion; routing the stream to a second encryption device; and encrypting the first portions using a second encryption process at the second encryption device to produce a selectively encrypted stream.
  • circuit functions are carried out using equivalent software or firmware embodiments executed on one or more programmed processors.
  • General purpose computers, microprocessor based computers, micro-controllers, optical computers, analog computers, dedicated processors, application specific circuits and/or dedicated hard wired logic and analog circuitry may be used to construct alternative equivalent embodiments.
  • Other embodiments could be implemented using hardware component equivalents such as special purpose hardware and/or dedicated processors.
  • Software and/or firmware embodiments may be implemented using a.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Storage Device Security (AREA)

Abstract

L'invention concerne un procédé de vidéo à la demande (VOD) consistant, dans certains modes de réalisation, à traiter un contenu par sélection de premières parties du contenu pour les chiffrer à l'aide d'un système de chiffrement sélectif, et par sélection de secondes portions du contenu destinées à rester non chiffrées. Les premières et les secondes parties sont stockées sur le serveur VOD. Si une demande est reçue d'un dispositif possédant des capacités de déchiffrement associées à un premier procédé de chiffrement, les premières parties seulement sont acheminées vers le dispositif de chiffrement, et les secondes parties sont acheminées autour de celui-ci. Ce résumé n'est pas à considérer comme limitatif, d'autres modes de réalisation pouvant en effet être dérivés des caractéristiques décrites dans ce résumé.
EP04795278.3A 2003-12-16 2004-10-18 Chiffrement de session composite d'un contenu video a la demande Ceased EP1695552B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
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EP1695552A4 (fr) 2010-08-25
WO2005060415A3 (fr) 2006-07-06
KR101085989B1 (ko) 2011-11-22
JP4694505B2 (ja) 2011-06-08
WO2005060415A2 (fr) 2005-07-07
KR20060117968A (ko) 2006-11-17
CN1977534A (zh) 2007-06-06
JP2007520927A (ja) 2007-07-26
EP1695552B1 (fr) 2013-08-07
US7343013B2 (en) 2008-03-11
CN1977534B (zh) 2010-05-26
US20050129233A1 (en) 2005-06-16

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